netdev - Re: phy: micrel.c: Support ksz9031 energy-detect power-down mode

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Date:   Tue, 27 Feb 2018 16:01:30 +0100
From:   Andrew Lunn <andrew@...n.ch>
To:     Maxim Uvarov <muvarov@...il.com>
Cc:     netdev <netdev@...r.kernel.org>,
        David Miller <davem@...emloft.net>,
        Florian Fainelli <f.fainelli@...il.com>
Subject: Re: phy: micrel.c: Support ksz9031 energy-detect power-down mode

On Tue, Feb 27, 2018 at 05:09:45PM +0300, Maxim Uvarov wrote:
> CC netdev
> 
> 2018-02-27 13:12 GMT+03:00 Maxim Uvarov <muvarov@...il.com>:
> > It migth be reason to reconsider of unconditionally enable power-down mode.
> > v1 of patch and code here:
> > https://lkml.org/lkml/2016/10/3/199
> >
> > I see that 9031 just lock ups with start from -40C just after
> > swtiching to power save mode. And any soft reset do not work. Chip is
> > not visible on mdio bus completely and only physycal power cycle
> > restores operation.  Temperature is acceptable for specifcication.

Hi Maxim

If it disappears, it makes me think it has lost its clock, the PLL has
lost lock.

How are you clocking the PHY? Do you have a crystal, or a 25MHz clock?
Have you checked the clock inputs are within spec at -40C?

     Andrew